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data("TradeCredit")
http://www.springeronline.com/sgw/cda/frontpage/0,10735,4-165-2-107420-0,00.html
Laffer, A.B. (1970). Trade Credit and the Money Market. Journal of Political Economy, 78, 239--267.
Baltagi2002
data("TradeCredit") plot(TradeCredit)
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